66901671 has 6 divisors (see below), whose sum is σ = 96635760. Its totient is φ = 44601108.

The previous prime is 66901669. The next prime is 66901699. The reversal of 66901671 is 17610966.

It is not a de Polignac number, because 66901671 - 2¹ = 66901669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66901631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3716751 + ... + 3716768.

It is an arithmetic number, because the mean of its divisors is an integer number (16105960).

Almost surely, 2^66901671 is an apocalyptic number.

66901671 is a deficient number, since it is larger than the sum of its proper divisors (29734089).

66901671 is a wasteful number, since it uses less digits than its factorization.

66901671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7433525 (or 7433522 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 66901671 is about 8179.3441668633. The cubic root of 66901671 is about 405.9560222371.

The spelling of 66901671 in words is "sixty-six million, nine hundred one thousand, six hundred seventy-one".